One more thing: the author of the article, Tom Vanderbilt, wrote a terrific book called "Traffic" and has a excellent blog (at http://www.howwedrive.com/ http:/

One more thing: the author of the article, Tom Vanderbilt, wrote a terrific book called "Traffic" and has a excellent blog (at http://www.howwedrive.com/ http://www.howwedrive.com/). It was from his blog that I found out about David Hembrow's blog.